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A broken or loose retainer nut allows the lower spray arm to lose rotation, preventing water from reaching all areas of the tub and leaving food residue on dishes.
A failed retainer nut lets the spray arm wobble and strike the dishwasher tub walls during the wash cycle, causing rattling or banging sounds.
When the retainer nut cracks or breaks off, the spray arm can dislodge and redirect water spray toward the door seals or base, causing water to leak onto the floor.
A completely broken retainer nut can no longer hold the lower wash arm to the pump hub, causing the arm to fall off entirely and halt the cleaning cycle.
💡 Pro Tip: How to Know Your Retainer Nut Has Failed
Your part is likely the culprit if you notice any of the following:
⚠️ Dishes come out dirty or with food residue — spray arm has lost proper rotation
⚠️ Rattling or banging noise during wash cycle — loose arm hitting tub walls
⚠️ Visible cracks, chips, or the nut has snapped in half on the retainer body
⚠️ Water pooling under dishwasher — broken nut allows spray arm to dislodge and misdirect water
🛠 Diagnosis tip: Pull out the lower rack and hand-spin the spray arm. If it wobbles, flops down, or won't stay seated, the retainer nut is broken or stripped. If the nut body is flush-broken with the hub, grip the remaining threads with needle-nose pliers and spin the hub disc counter-clockwise to remove before installing the new nut.
📦 What's in the Box
✅ 1× Dishwasher Wash Arm Retainer Nut (9742945 / WP9742945) — ABS Plastic, approx. 1.8"L × 1.5"D
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Disclaimer: Compatibility information, part numbers, and model fitment data on this page are sourced from manufacturer databases and third-party references. While we strive for accuracy, please verify your appliance model number before ordering. Heima is not responsible for errors or omissions in compatibility listings.
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